[Boost-users] Bug in XML serialization!!!
Piyush Kapadia
Following code results in “unrecognized XML syntax” exception while writing to XML file.
However if I change xml_oarchive to text_oarchive or binary_oarchive, it works fine, so I assume it’s a bug in xml_oarchive ??? Does any one know how to fix this for xml_oarchive ???
#include <iostream>
#include <fstream>
#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>
#include <boost/archive/xml_iarchive.hpp>
#include <boost/archive/xml_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/serialization/vector.hpp>
#include <boost/serialization/map.hpp>
#include <vector>
#include <map>
#include <boost/archive/archive_exception.hpp>
#include <boost/archive/basic_xml_archive.hpp>
class base {
protected :
std::vector<int> vec;
protected :
friend class boost::serialization::access;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & BOOST_SERIALIZATION_NVP(vec);
}
public :
void add(int i) { vec.push_back(i); }
int get(int idx) { return vec[idx]; }
};
class derived : public base {
friend class boost::serialization::access;
std::map<std::string, int> hmap;
template<class Archive>
void serialize(Archive & ar, const unsigned int version)
{
ar & BOOST_SERIALIZATION_NVP(boost::serialization::base_object<base>(*this));
ar & BOOST_SERIALIZATION_NVP(hmap);
}
public :
void add(std::string str, int i) { hmap[str] = i; base::add(i); }
int get(std::string str) { return hmap[str]; }
};
int main(int argc, char* argv[])
{
try {
derived A;
A.add("First", 12);
A.add("Second", 34);
const derived AA = A;
std::ofstream ofs("Test.xml");
assert(ofs.good());
boost::archive::xml_oarchive oa(ofs);
oa << BOOST_SERIALIZATION_NVP(AA);
ofs.close();
derived B;
std::ifstream ifs("Test.xml");
assert(ifs.good());
boost::archive::xml_iarchive ia(ifs);
ia >> BOOST_SERIALIZATION_NVP(B);
ifs.close();
}
catch (boost::archive::xml_archive_exception ex)
{
std::cerr << " X " << ex.what() << std::endl;
}
catch (boost::archive::archive_exception ex)
{
std::cerr << " A " << ex.what() << std::endl;
}
catch (std::exception ex)
{
std::cerr << " E " << ex.what() << std::endl;
}
catch (...)
{
std::cerr << "Unknown Exception " << std::endl;
}
return 0;
}
Richard Jennings
boost:serialization::make_nvp
in place of the macro:
ar & boost::serialization::make_nvp("base",
boost::serialization::base_object<base>(*this));
The macro uses the parameter as the name for the XML element. Because
it's a templated type
then the angle brackets are probably included in the name, which would be
invalid XML
syntax.
Richard
On Fri, 21 Oct 2005 03:26:05 +0100, Piyush Kapadia
<piyush....@gmail.com> wrote:
> Following code results in "unrecognized XML syntax" exception while
> writing
> to XML file.
>
> {
>
> ar &
> BOOST_SERIALIZATION_NVP(boost::serialization::base_object<base>(*this));
>
> ar & BOOST_SERIALIZATION_NVP(hmap);
>
> }
>
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Piyush Kapadia
<base class_id="1" tracking_level="0" version="0">
<vec>
<count>2</count>
<item>12</item>
<item>34</item>
</vec>
</base>
<hmap class_id="3" tracking_level="0" version="0">
<count>2</count>
<item class_id="4" tracking_level="0" version="0">
<first>First</first>
<second>12</second>
</item>
<item>
<first>Second</first>
<second>34</second>
</item>
</hmap>
</AA>
However two issues persists related to XML -
The following tags were not closed: boost_serialization. Error processing resource 'file:///C:/Documents and Settings/piyus... Some how it failes to write </boost_serialization> at the end of the file, I don't know why ??? I have included test code and I am using VC 7. |
Robert Ramey
"Piyush Kapadia" <piyush....@gmail.com> wrote in message
two issues persists related to XML -1. When xml out put file opened on Internet Explorer it results in following legitimate error -
The following tags were not closed: boost_serialization. Error processing resource 'file:///C:/Documents and Settings/piyus...
Some how it failes to write </boost_serialization> at the end of the file, I don't know why ???
I have included test code and I am using VC 7.
Robert Ramey
This is usually caused by code like the following:
{
..ostream os("file");
..oarchive oa(os);
oa << ....
os.close(); // close or destroy output stream
// destructor on oa called after stream closed
}